Process of making a cellulose acetate semipermeable membrane

Details Process of making a cellulose acetate semipermeable membrane Process of making a cellulose acetate semipermeable membrane

1995-06-01

1997-07-08

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264148, 264203, 26421113, 26421114, 26421116, 26421119, 264232, 264233, 264261, B29C 6720, D01D 5247

Patent

active

056457782

ABSTRACT:
Methods are disclosed for making semipermeable membranes from cellulose acetate and for making medical devices therefrom. In the process, a molten liquid comprising cellulose acetate (CA), a solvent for CA, and a non-solvent for CA is extruded to produce a membrane. The solvent and non-solvent are removed from the membrane to produce a semipermeable membrane having a water permeability. The semipermeable membrane is impregnated with a liquid consisting essentially of water to render the semipermeable membrane capable of being stored until time of use without undergoing a substantial loss in water permeability. The semipermeable membrane can be incorporated in a casing in order to produce a medical product, wherein the membrane is impregnated in the product.

REFERENCES:
patent: 4276173 (1981-06-01), Kell et al.
patent: 4543221 (1985-09-01), Chen et al.
patent: 5182868 (1993-02-01), Porta et al.

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